[系统运维]06 k8s- kubelete资源限制

kubelet

• 没有容器化

[root@k8s-master1 k8s]# ls /etc/kubernetes/manifests/
etcd.yaml  kube-apiserver.yaml  kube-controller-manager.yaml  kube-scheduler.yaml
[root@k8s-master1 k8s]# 

静态pod

• 创建命令
  • kubectl run static-pod --image=nginx --dry-run=client -o yaml > pod.yaml
• kubelet进行管理
• 不实用容器
• pod名称标示当前节点

重启静态pod

• /etc/kubernetes/manifests/ 配置文件
• 移走并移回 就能完成重启

list-watch

• 查看调度流程
• apiServer是中转站
• etcd是最终数据存储位置

影响pod调度中的因素

• 容量资源限制
  • cpu
  • memory
• 最小资源限制
  • cpu
  • memory

yaml

apiVersion: v1
kind: Pod
metadata:
  name: resources-test-pod
spec:
  containers:
  - image: nginx
    name: web
    resources:
      requests:
        cpu: 0.4
        memory: 500Mi
      limits:
        cpu: 0.4
        memory:	500Mi 

验证

• [root@k8s-master1 6]# kubectl describe pod resources-test-pod
• 查看cpu memroy 选项

验证二

• kubectl get pod -o wide
  • 找对应的node节点
• kubectl describe node k8s-node2

Non-terminated Pods:          (17 in total)
  Namespace                   Name                                          CPU Requests  CPU Limits  Memory Requests  Memory Limits  Age
  ---------                   ----                                          ------------  ----------  ---------------  -------------  ---
  default                     init-demo                                     0 (0%)        0 (0%)      0 (0%)           0 (0%)         45h
  default                     nginx-6799fc88d8-hn88v                        0 (0%)        0 (0%)      0 (0%)           0 (0%)         2d
  default                     pod-check-d59cbdb46-9w62f                     0 (0%)        0 (0%)      0 (0%)           0 (0%)         3d
  default                     pod-check-d59cbdb46-g8qjf                     0 (0%)        0 (0%)      0 (0%)           0 (0%)         3d
  default                     pod-check-d59cbdb46-k7j59                     0 (0%)        0 (0%)      0 (0%)           0 (0%)         3d
  default                     pod-envars                                    0 (0%)        0 (0%)      0 (0%)           0 (0%)         47h
  default                     pod-net-test                                  0 (0%)        0 (0%)      0 (0%)           0 (0%)         6d
  default                     pod-volume-test                               0 (0%)        0 (0%)      0 (0%)           0 (0%)         5d23h
  default                     resources-test-pod                            400m (20%)    400m (20%)  500Mi (16%)      500Mi (16%)    10m

• 查看内存 cpu 分配情况

注意

• request资源限制必须小于等于limits
  • 否则pod会进入pending状态